For problems related to the HTML 5 media elements (<video> and <audio>) -- including WebM, MP4, MSE and EME issues. This would also typically include decoding problems in the codecs themselves (e.g. VP8, VP9, H.264, AAC) experienced during playback.

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Created attachment 8803995[details]
report.txt
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:51.0) Gecko/20100101 Firefox/51.0
Build ID: 20161024004016
Steps to reproduce:
With 51.0(a2) version, I can't get audio on some videos, like this one : http://video.webmfiles.org/big-buck-bunny_trailer.webm
I get only like 100ms when I seek part of the video, but it cut right after. Web player like youtube works (but it seems ads do not).
What is weird is that it works with the 49 version (they are both installed).
And it works when I use my headset (plugged in usb), but not with my sound card (Creative X-FI Titanium)
I join my debug report.
Actual results:
No audio
Expected results:
I should have the audio of the video !

I feel really bad because I looked really **** lots of site (reddit, google, bugzilla), and still missed this bug report. This is definitelly a duplicate, first exe works, second doesn't. Sorry for wasting time.
Keep up the great work !